Yukino is a former spy and assassin for the Warrior Viper Clan. She looks just like Koyuki but with a rebel personality. She used to work for the warrior Vipers but she was tricked by them. She also revealed herself to Dororo as one of the legendary guardians who saved Sengoku. She is also a master of disguise.

Yukino looks exactly like Koyuki Azumaya. She has fair colored skin, long teal hair held together in a ponytail by a burgandy colored ribbon.she also wears a black headband that has a blue gem encrusted in it. She has green eyes and her mouth is usually covered by her light grayish blue scarf. She wears a long sleeved fishnet body suit with a dark gray body suit that is cut on the left side. She wears one metal shoulder pad on her right side. Yukino also wears black gloves that are cut on in the middle, a black belt with her dark blue gem in it. She wears black combat boots, and has a katana blade held by a white string across her chest.